iClarified says that there's an untethered jailbreak for iPhone4 for iOS 4.3.1 which is the most up-to-date version of iOS as of writing this question. Let's assume we are talking for unlocked phones. My question is which tool is better - RedSn0w or PwnageTool? My question is valid not only for 4.3.1.
Wikipedia says "redsn0w is a utility to jailbreak iOS devices" and "PwnageTool is an iPhone jailbreaking application for Mac OS X that creates custom iOS firmware images" (cannot post a third link, but that one is easy to find).
Reasoning for the question: I have read on several places that an irreversible thing could be made to a iDevice (iPhone for example) that mutilates it somehow and it cannot receive updates from iTunes with stock iOS and only custom iOSes can be installed. Wikipedia says redsn0w is a jailbreak utility while PwnageTool creates custom iOS.
Second question: does PwnageTool do the irreversible thing I have read about? Does redsn0w do that either?